package cn.tedu.boot21.controller;

import cn.tedu.boot21.entity.User;
import cn.tedu.boot21.utils.DBUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

@Controller
public class UserController {
    @RequestMapping("/reg")
    @ResponseBody
    public String reg(User user){
        //得到数据库连接

        try(Connection conn = DBUtils.getConn()) {
            //使用PreparedStatement 实现注册功能 并实现用户名不能重复的功能
            String sql = "select id from user where username=?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1, user.getUsername());
            ResultSet rs = ps.executeQuery();
            if(rs.next()){
                return "用户名已存在";
            }

            String insertSql = "insert into user values (null,?,?,?)";
            PreparedStatement insertPs = conn.prepareStatement(insertSql);
            insertPs.setString(1,user.getUsername());
            insertPs.setString(2, user.getPassword());
            insertPs.setString(3, user.getNick());
            insertPs.executeUpdate();


        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return "注册成功!";
    }
    @RequestMapping("/login")
    @ResponseBody
    public String login(User user){
        try (Connection conn = DBUtils.getConn()){
            String sql = "select password from user where username=?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1, user.getUsername());
            ResultSet rs = ps.executeQuery();
            if (rs.next()){
               if (rs.getString(1).equals(user.getPassword())){
                   return "登录成功!";
               }
               return  "密码错误!";
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return "用户名不存在";
    }
}
